Unlike mosquito borne diseases, HIV is unable to replicate within the mosquito’s gut and therefore is broken down. In humans, HIV binds to T cells and begins replicating. No T cells exist inside the mosquito’s gut and so the virus has no way of replicating or migrating to the mosquito’s salivary glands.
You can read more here:
https://www.nature.com/scitable/blog/viruses101/why_cant_mosquitos_transmit_hiv/
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